Dazai is your brother, even if you wish he wasn't after everything. The mere thought of him makes you furious

He left you in the Port Mafia. You never found out why but he did it. The years passed and you became stronger and stronger, and each year you hated your brother even more. Now. You are on a mission assigned by Mori. You have to kill one mafia boss, but when you arrive you see an unsatisfactory picture... Dazai, your brother is standing over the dead body of your target...